Steam-superheater.



R. ALLEN. STEAM SUPERHEATER. APPLICATION FILED DEC- 30. l9l5.

N 3 @Q w w Q 9M0 a? 2 7/ M W/TIYEJS STEAM-SUPERHEATER.

Specification of Letters Patent.

Patented rape, 11918,

Original application filed {July 2, 1913, Serial No. 777,049. Divided and this application filed December 30,

1915. Serial N0.69i,458.

I To all whom it may concern:

Be it known that 1, ROBERT ALLEN, a subject of the King of Great Britain and Ireland, residing at Lynwood, Kidmore Road,

EL Caversha'm, Oxfordshire, England, have invented certain new and useful Improvements in Steam-Superheaters, of which the following is a specification.

This invention relates to a tubular steam superheater for locomotive, marine, and other boilers, and is a division of application Serial No. 777,049, filed July 2, 1913. The object of the the ready removal of soot or other material from the interior of the superheating tubes to facilitate the transmission of heat from the combustion gases to the steam and generally to provide an eiiicient superheater of simple construction which can be conveniently fitted into the smoke boxes of locomotives and other smoke-tube boilers.

Another object of the invention is to provide for the greatest possible contact between the steam and the superheating tubes during the travel of the steam from the inlet to the outlet of the apparatus, and also to so arrange that the steam coming from the boiler shall be admitted to the superheater at that point from which the heating gases are expelled and, traveling through the apparatus, shall leave same at or near the point of admission of the hot gases from the boiler tubes, thereby securing the maximum heating effect.

According to this invention,

tubes, preferably provided with coincident internal and external spiral ribs formed solid withthe' tubes or welded or soldered to the tubes as described in British Patent No. 15,574/12, are arranged horizontally in boxes or casings provided with baflies and constructed to facilitate the admission of steam to the tubes for cleaning them.

' The invention is hereinafter, described with reference to the accompanying drawings in which,

Figures 1 and 2 are sectional front and sectional side elevations respectively of a superheater constructed according to this invention.

As shown", superheating tubes a formed with internal and external helical ribs 12 are fitted horizontally in casings, divided vertically into two units 0 of box section, each invention is to provide for having tubes a passing through them, separate apparatus each composed of twounits being provided for each cylinder.

One of these units is provided. with an extended side which corresponds and makes joint withthe side of the other unit, thus forming, between the two units, an inclosed steamtight space it. V

Similarly as shown at a Fig. 2 the tubes a of one unit extend through and beyond the back, the same distance as the extended side above mentioned; and these extended tubes being in register with the corresponding tubes in the other unit or joint with them and form a continuous .tube through both the units. The entire apparatus is, in the case of a locomotive, fixed in thesmoke box in suitable relative position to the fire tubes.

In the front unit, that is the unit farthest from the smoke tube plate, bafie are arranged in the form of thin sheet metal partitions 2' so disposed as to group the superheating tubes into a continuous path, along which the steam is compelled to pass in such a manner as to increase the contact of the steam with the heating tubes to the maximum available.

The back unit, which is nearest to the boiler tube plate is arranged with similar partitions or bafiles 2' shown on the left in Fig. 1, so disposed as to cause the steam to travel from side to side'in a path approximately at rightangles to the travel through the front unit.

The steam in this way makes a complete circuit of the superheater, being admitted at e at the forward end of the front, unit,

caused to travel several times up and down it to a communicating cross connection 6 by which it is conducted into the back unit,

through which latter it passes, as above de- 1 space it between the two units and a suitable connection Z is arranged for the admission of live steam into the said space, whereby such steam maybe blown into the tubes through the holes from time to time as reunits, make quired, and internal cleaning of the tubes thus efiected.

' the internal ribs.

As shown in the right half of Fig. 1 which is a section through the space h, vertical baffle plates or across the intermediate splace. h between the more,

two units, with a branc ed steam inlet 1 counicating with each section of the space so partitioned in order to provide for a more equal distributing of the steam, and thus obviate any restricted path being taken by same and to equalize the cleaning efiect. desired the space described above as intermediate between the two units may be arranged in' combination with a single unit. Provision may.be also made for the admission of. live steam at the bottom as well as the top of the superheater, to increase the cleaning efiect.

I do not confine my invention to the combination of two units, as described which may, if necessar be increased to three or and as wil be readily understood one such apparatus comprising one or more units may be rovided for both cylinders or for each cy under in the case of locomotive boilers.

B inserting rods in the center of the tubes to c ose the passage between the ribs the 'vided into units, tube extended side partition 1 may be arranged meat-as can be compelled to flow through the tubes.

by Letwhole of the gases in a helical course What ll claim and desire to secure ters Patent is 1. A superheater comprising a casing dipassing through each of-said units, one 0 said units having an which makes jointwith its cooperating unit forming a steam-tight chamber between them through also pass, said tubes having apertures in the portions thereof which pass through said steam-tight chamber, and means for admitting steam to said space.

2. A superheater comprising open-ended tube for the passage'of the hot gases, a casin to which said tubes are fitted and prowhich said tubes vi ed with steam inlet and outlet connections, and a separate steam-tight chamber in the casing communicating with the tubes and serving to convey steam to said tubes for cleaning them.

3. A superheater comprising open-ended tube and separate casings into whichsaid tube are fitted, each casing with its tubes forming a. unit, to provide a steam-tight chamber between them, said chamber communicating with the interior of the tubes through suitable. openings and serving to convey steam to the tubes for cleaning them internally In testimony whereof I have afiixed my signature.

ROBERT LEN. 

